tcc.c

nucleus plus ARM9 source code

    /* Switch to supervisor mode */
    NU_SUPERVISOR_MODE();

    /* Move input HISR pointer into internal pointer.  */
    hisr =  (TC_HCB *) hisr_ptr;


#ifdef  NU_ENABLE_STACK_CHECK

    /* Call stack checking function to check for an overflow condition.  */
    TCT_Check_Stack();

#endif

#ifdef  NU_ENABLE_HISTORY

    /* Make an entry that corresponds to this function in the system history
       log.  */
    HIC_Make_History_Entry(NU_DELETE_HISR_ID, (UNSIGNED) hisr,
                                        (UNSIGNED) 0, (UNSIGNED) 0);

#endif

    /* Protect the list of created HISRs.  */
    TCT_Protect(&TCD_HISR_Protect);

#ifdef INCLUDE_PROVIEW
    _RTProf_DumpHisr(hisr,RT_PROF_DELETE_HISR);
#endif /*INCLUDE_PROVIEW*/

    /* Remove the HISR from the list of created HISRs.  */
    CSC_Remove_From_List(&TCD_Created_HISRs_List, &(hisr -> tc_created));

    /* Decrement the total number of created HISRs.  */
    TCD_Total_HISRs--;

    /* Clear the HISR ID just in case.  */
    hisr -> tc_id =  0;

    /* Release protection.  */
    TCT_Unprotect();

    /* Return to user mode */
    NU_USER_MODE();

    /* Return a successful completion.  */
    return(NU_SUCCESS);
}


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      TCC_Reset_Task                                                   */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function resets the specified task.  Note that a task reset */
/*      can only be performed on tasks in a finished or terminated state.*/
/*      The task is left in an unconditional suspended state.            */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*      TCCE_Reset_Task                     Error checking shell         */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      [HIC_Make_History_Entry]            Make entry in history log    */
/*      TCT_Build_Task_Stack                Build an initial task stack  */
/*      [TCT_Check_Stack]                   Stack checking function      */
/*      TCT_Protect                         Protect created task list    */
/*      TCT_Unprotect                       Release protection of list   */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      task_ptr                            Task control block pointer   */
/*      argc                                Optional task parameter      */
/*      argv                                Optional task parameter      */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_SUCCESS                          Indicates successful request */
/*      NU_NOT_TERMINATED                   Indicates task was not       */
/*                                            finished or terminated     */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*        DATE                    REMARKS                                */
/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*      03-01-1994      Modified function interface,                     */
/*                      added register optimizations,                    */
/*                      added system protection logic,                   */
/*                      resulting in version 1.1                         */
/*                                                                       */
/*      03-18-1994      Verified version 1.1                             */
/*                                                                       */
/*************************************************************************/
STATUS  TCC_Reset_Task(NU_TASK *task_ptr, UNSIGNED argc, VOID *argv)
{

R1 TC_TCB      *task;                       /* Task control block ptr   */
STATUS          status;                     /* Status of the request    */
NU_SUPERV_USER_VARIABLES

    /* Switch to supervisor mode */
    NU_SUPERVISOR_MODE();

    /* Move input task pointer into internal pointer.  */
    task =  (TC_TCB *) task_ptr;

#ifdef  NU_ENABLE_STACK_CHECK

    /* Call stack checking function to check for an overflow condition.  */
    TCT_Check_Stack();

#endif

#ifdef  NU_ENABLE_HISTORY

    /* Make an entry that corresponds to this function in the system history
       log.  */
    HIC_Make_History_Entry(NU_RESET_TASK_ID, (UNSIGNED) task,
                                        (UNSIGNED) argc, (UNSIGNED) argv);

#endif

    /* Protect system structures.  */
    TCT_Protect(&TCD_System_Protect);

    /* Determine if the task is in the proper state.  */
    if ((task -> tc_status == NU_FINISHED) ||
                        (task -> tc_status == NU_TERMINATED))
    {

        /* Yes, a valid reset is present.  Indicate this in the status.  */
        status =  NU_SUCCESS;

        /* Fill in the new argument information and reset some of the other
           fields.  */
        task -> tc_argc =                   argc;
        task -> tc_argv =                   argv;
        task -> tc_status =                 NU_PURE_SUSPEND;
        task -> tc_delayed_suspend =        NU_FALSE;
        task -> tc_scheduled =              0;
        task -> tc_stack_minimum =          task -> tc_stack_size;

#if (NU_SUPERV_USER_MODE == 1)
        /* Since we are doing a complete reset we need to ensure 
           that this field is 0 since the task will be started in
           user mode.  TCC_Task_Shell can not return and therefore
           left the task in supervisor mode when the task completed.
           If we were to not re-initialize this field the task would
           become locked in user mode and API would fail. */
        task -> tc_su_mode = 0;
#endif

        /* Build a stack frame for this task by calling
           TCT_Build_Task_Stack.  */
        TCT_Build_Task_Stack(task);
    }
    else

        /* The requested task is not in a finished or terminated state.  */
        status =  NU_NOT_TERMINATED;

#ifdef INCLUDE_PROVIEW
    _RTProf_DumpTask(task,RT_PROF_RESET_TASK);
#endif /*INCLUDE_PROVIEW*/

    /* Release the protection.  */
    TCT_Unprotect();

    /* Return to user mode */
    NU_USER_MODE();

    /* Return completion status.  */
    return(status);
}


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      TCC_Terminate_Task                                               */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function terminates the specified task.  If the task is     */
/*      already terminated, this function does nothing.  If the task     */
/*      to terminate is currently suspended, the specified cleanup       */
/*      routine is also invoked to cleanup suspension data structures.   */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*      TCCE_Terminate_Task                 Error checking shell         */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      Cleanup routine                     Task's suspend cleanup funct */
/*      [HIC_Make_History_Entry]            Make entry in history log    */
/*      TCC_Suspend_Task                    Suspend a ready task         */
/*      [TCT_Check_Stack]                   Stack checking function      */
/*      TCT_Protect                         Protect created task list    */
/*      TCT_Unprotect                       Release protection of list   */
/*      TCT_Unprotect_Specific              Specific unprotection        */
/*      TMC_Stop_Task_Timer                 Stop a task timer            */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      task_ptr                            Task control block pointer   */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_SUCCESS                                                       */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         DATE                    REMARKS                               */
/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*      03-01-1994      Modified function interface,                     */
/*                      added register optimizations,                    */
/*                      added system protection logic,                   */
/*                      resulting in version 1.1                         */
/*                                                                       */
/*      03-18-1994      Verified version 1.1                             */
/*                                                                       */
/*************************************************************************/
STATUS  TCC_Terminate_Task(NU_TASK *task_ptr)
{

R1 TC_TCB      *task;                       /* Task control block ptr    */
TC_PROTECT     *suspend_protect;            /* Suspension protection ptr */
DATA_ELEMENT    status;                     /* Task status               */
NU_SUPERV_USER_VARIABLES

    /* Switch to supervisor mode */
    NU_SUPERVISOR_MODE();

    /* Move task pointer into internal pointer.  */
    task =  (TC_TCB *) task_ptr;


#ifdef  NU_ENABLE_STACK_CHECK

    /* Call stack checking function to check for an overflow condition.  */
    TCT_Check_Stack();